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I have a 2006 750li with 1000 miles. Just got the car and couldn't be happier.

When the car starts after sitting for a while, the engine kind of stumbles a bit for the first 5 or so seconds. The dealer says that this is inherent to the 7 and not to worry. This this normal? Seems a bit strange, but this is my first 7.

Many things are happening when you start up the 7er in the morning. I am sure you only experience this when the car has been sitting for 7+ hours, correct?

-Diagnostics (Making sure all system are working as they should).
-Sensors (Being queried to support the above statement).
-4.8 litre is tuned to run high (Hard) in the first 2-5 minutes.
-Make sure you Climate Control is off when turning on the engine.
- Why? If the air system is active, the car has to put energy into that
process.

I did hear that a software upgrade can help with the rough initial idle. There's some optimization that has been tweaked out.....You may want to consider having the dealer upgrade your system........Couldn't hurt.

We have the same problem with our 2001 525i - rough morning starts. We consulted our dealer, and it was simply poor gas quality affecting the injectors. We only use top teer gas (Chevron). We have been using Redline SI-1 Complete Fuel System Cleaner and the problem goes away completely. You can use this as a way to diagnose further - or it may be your solution. The fuel quality is simply not good enough for our precision injectors.

We use half a bottle once every two months or as needed...sometimes less. It is really an amazing product. I found it at the local CarQuest.